Oxidation of hexaaquoiron(II) by periodate in aqueous acidic solution

✍ Scribed by Fouad.R. El-Eziri; Yousif Sulfab

• Publisher: Elsevier Science
• Year: 1977
• Tongue: English
• Weight: 429 KB
• Volume: 25
• Category: Article
• ISSN: 0020-1693
• DOI: 10.1016/s0020-1693(00)95685-8

✦ Synopsis

The oxidation of Fe(H) by periodate in aqueous acidic solutions obeys the rate law (i)

Rate

= {k, + k,/[fl]} [Fe(H)]' + kk'[Wll)l W-IT WI + k3 [Wll)l 2 [L-l T where [L61T represents the total periodate concentration. The magnitudes of k,,, k;, ky and k3 are 0.235 set-', 120 set-', 7.5 f 1.5 set-I, and (7.3 f 0.5) X 104p set? respectively at 25 'Cand I = 1.0 h4. The ttW?IS in equation (i), that are first order in [L-]T, correspond to the oxidation process with possibly one-electron (term showing first order in [FefII)] and two electron-transfer (term showing second order in [Fe(II)] . At low [fl (0.10 M), the pathway first order in [Fe(IZ)] predominates, whereas at high [H+j (0.80 M), the term second order in [Fe(II)] prevails. An explanation of the term independent of [L-IT is not quite obvious.